The factory rubber rear upper shock mount for the 86 chassis is a big rubber mount, They wear out over time, can dry crack, even come apart completely. When these mounts are new they have a lot of slop and "slow down" damper reactions to vertical inputs in the shocks. We can fix all of that.
Vorshlag has been making spherical shock mounts for years, for a variety of chassis: Corvette, BMW, NA/NB Miata and more. These mounts specifically for the the Subaru GR/GV and BRZ and Scion FRS chassis are made in house here at Vorshlag and feature our oversized spherical bearing you'll find in our camber plates. These shock mounts are big, beefy, and as strong as a tank. Removing the stock rubber top mounts and replacing them with spherical top mounts will drastically improve suspension articulation and movement.